Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC2006G6 GTP, 2D COUPE, STANDARDREPAIR AND DIAGNOSISBODY & FRAMEWINDOWSSTATIONARY WINDOW SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW DEFOGGER INOPERATIVE (C68 AUTO A/C) DIAGNOSTIC FAULT INFORMATIONCIRCUIT/SYSTEM TESTINGREAR DEFOGGER MALFUNCTION
2006 Pontiac G6 GTP, 2D Coupe, Standard
Rear Defogger Malfunction
2006 Pontiac G6 GTP, 2D Coupe, StandardSECTION Rear Defogger Malfunction
- Ignition OFF, disconnect the RR DEFOG relay.
- Test for less than 1.0 ohm of resistance between the relay coil ground circuit and ground. => If greater than the specified range, test the relay coil ground circuit for an open/high resistance.
- Ignition ON, verify that a test lamp does not illuminate between the relay controlled output circuit and ground. => If the test lamp illuminates, test the relay controlled output circuit for a short to voltage.
- Verify that a test lamp illuminates between the relay switch B+ circuit and ground. => If the test lamp does not illuminate, test the relay switch B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the fuse is open, test the relay controlled output circuit for a short to ground.
- Disconnect the harness connector at the rear window defogger grid.
- Ignition OFF, test for less than 1.0 ohm of resistance between the rear window defogger grid ground circuit and ground. => If greater than the specified range, test the ground circuit for an open/high resistance.
- Connect the harness connector C1 at the rear window defogger grid.
- Ignition ON, connect a 30-amp fused jumper wire between the relay switch B+ circuit and the relay controlled output circuit. Verify the rear window defogger grid is activated. => If the rear window defogger grid does not activate, test the relay controlled output circuit for an open/high resistance. If the circuit tests normal, test or repair the rear window defogger grid.
- Connect a test lamp between the rear defogger control circuit and the relay coil ground circuit.
- Command the rear defog relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states. => If the test lamp is always ON, test the rear defogger control circuit for a short to voltage. If the circuit tests normal, replace the BCM. => If the test lamp is always OFF, test the rear defogger control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
- If all circuits test normal, test or replace the RR DEFOG relay.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.